by I have a linux-2.4.5 box connected to the Internet via PacBell DSL. My box
is also doing NAT and masquerading duties for my internal network. A problem
has risen recently with DNS. A week or so ago, I noticed that my Internet
connection speed was slowing down. I checked my linux box and discovered
that I was getting dropped packets whenever I pinged a node beyond my
gateway. I restarted the box and eveything seemed fine. Now, I am
encountering the problem again, and a reboot does not clear it up. Here's
the symptoms. When I use "ping -c 20 www.business.com", I usually receive >
30% packet loss. At the same time I am running the ping, I am using ethereal
to watch the traffic on my DSL interace(eth0). On ethereal's output, I see a
DNS query to the primary DNS server(dns1), a correct reply, 20 ICMP ping
requests AND replies. Also, I see queries to the secondary DNS server. It
seems odd to me that ping reports packet loss while ethereal reports all
request packets answered. Another item is that if I ping by IP address, I
experience no packet loss. I am looking for suggestions on how to track down
this problem. I suspect the problem may be with PacBell, but I need more
evidence before I go after them.
Any ideas?
CJ